Gemini XPRIZE submission · built on the Google stack
Your heartbeat writes the soundtrack.
VO₂max.One reads your live heart rate, prescribes the session your physiology actually needs, and generates the music at that exact tempo. Every render is watermarked, disclosed and sealed.
- 5
- heart-rate zones
- 6
- phases per session
- 4
- public API endpoints
- 100%
- sessions hash-chained
How it works
Five steps, no guesswork
Your watch streams the beat
Apple Watch, Fitbit or any BLE chest strap. We read heart rate, HRV and cadence — never location, never audio.
Physiology becomes a prescription
Tanaka predicted max plus Karvonen heart-rate reserve gives a real target band, not a vibe. Six phases, one per stage of the session.
Music is generated at that tempo
Every phase gets a BPM anchor folded from your heart-rate target, so the track pulls you toward the zone instead of away from it.
The render is watermarked
Each track carries an inaudible payload tying audio to prescription and session, plus an AI disclosure a machine can read.
The record is sealed
Sessions land in an append-only, hash-chained ledger. Anyone can verify the chain without seeing your identity.
The science
VO₂max is the strongest predictor we have
Maximal oxygen uptake tracks all-cause mortality more tightly than smoking status, blood pressure or cholesterol. Moving one fitness quintile is one of the largest modifiable effects in the literature — and the training that moves it is boring, repeatable zone work. Music is the adherence mechanism.
Zone 1
Recovery
50–60% HRR
Blood flow and repair. Conversation stays effortless.
Zone 2
Aerobic base
60–70% HRR
Mitochondrial density and fat oxidation. The healthspan zone.
Zone 3
Tempo
70–80% HRR
Sustained power. Comfortably hard, speech in short phrases.
Zone 4
Threshold
80–90% HRR
Lactate clearance. Raises the ceiling you can hold.
Zone 5
VO₂max
90–100% HRR
Maximal oxygen uptake. Short, sharp, fully committed.
Live estimator
Try it right now
No account needed. Drag your numbers, pick a workout, and get the real prescription with a Gemini coaching cue attached.
Step 1 · your numbers
entered manually
Don't know your VO₂max?
Uth–Sørensen non-exercise estimate · Tanaka HRmax — from age 38 and resting HR 58, estimated HRmax 181 bpm.
Sign in to seal estimator runs into your history trend.
Step 2 · device
Step 3 · today's workout
Step 4 · how you want to feel
Set your numbers and generate a prescription. Nothing is stored until you seal it.
Bringing a catalogue, a gym or a broadcast?
Partner intake covers volume, Content ID reference delivery and revenue split.